So, yeah, after that boo-boo last week, it was time for me to take another look into the PAM8403 amplifier module. The very idea of just using the 2W amp is just not really that exciting. As far as the JQ6500-16P board is concerned, it was the 8002A amplifier which was totaled. The idea of forcing a 2W audio down into a 3W amplifier was not such a great idea after all.
So, with much regret and like an obedient little boy, I connected the JQ6500-16P’s ADC output into the PAM8403’s input, and the Speaker connection is unchanged. And boy, the sound was still great as ever! So, now that is left is to go back to the original idea which is to turn the PAM8403 amplifier off when it is not being used.
There only ‘microcontroller’ in the JQ6500-16P Module is the chip itself. Therefore, the only way to get the SHUTDOWN signal is to rely on the BUSY signal. It goes HIGH when a sound file is being played and goes LOW once the playback is completed. So, I would have to invert this signal to turn the PAM8403 amplifier off. Not only that, I would have to remove the 0 ohm resistor ‘R‘ to disconnect it from the GND (Black) as this is the LOW signal which keeps the amplifier on at all times.
There’s not much change to the circuit at the moment because I am waiting for the additional components to arrive. The only thing I have added is the PAM8403 module and connected the 8 Ohm 3W speaker to it. Yeah, its SHUTDOWN Pin is KIV at the moment.
